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6. Ligand-channel-enabled ultrafast Li-ion conduction

Author

Lu, Di, Li, Ruhong, Rahman, Muhammad Mominur, Yu, Pengyun, Lv, Ling, Yang, Sheng, Huang, Yiqiang, Sun, Chuangchao, Zhang, Shuoqing, Zhang, Haikuo, Zhang, Junbo, Xiao, Xuezhang, Deng, Tao, Fan, Liwu, Chen, Lixin, Wang, Jianping, Hu, Enyuan, Wang, Chunsheng, and Fan, Xiulin

Published
2024
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32. In situ healing of dendrites in a potassium metal battery

Author

Hundekar, Prateek, Basu, Swastik, Fan, Xiulin, Li, Lu, Yoshimura, Anthony, Gupta, Tushar, Sarbada, Varun, Lakhnot, Aniruddha, Jain, Rishabh, Narayanan, Shankar, Shi, Yunfeng, Wang, Chunsheng, and Koratkar, Nikhil

Published
2020

35. Advanced Molecular Layer Deposition of SixZnyOz Thin Film Coatings for Improved Electrochemical Performance of NMC811.

Author

Akella, Sri Harsha, Mukherjee, Ayan, Lidor‐Shalev, Ortal, Bashkurov, Roman, Wang, Yang, Buchine, Isaac, Wang, Longlong, Zysler, Melina, Ejgenberg, Michal, Kravchuk, Tatyana, Kozen, Alexander C., Bravo‐Zhivotovskii, Dmitry, Apeloig, Yitzhak, Lee, Sang Bok, Fan, Xiulin, Leskes, Michal, and Noked, Malachi

Subjects
SURFACE passivation, THIN films, THIN film deposition, OXIDIZING agents, CATHODES
Abstract

The practical realization of Nickel‐rich layered oxide cathode materials such as LiNi0.8Mn0.1Co0.1O2 (NMC811) is hampered by several structural and interfacial instabilities over prolonged cycling. Several reports have proposed surface passivation via an artificial cathode electrolyte interphase (ACEI) as a promising method for mitigating the parasitic reactions affecting NMC811 while simultaneously improving its electrochemical performance over prolonged cycling. Herein, we report an in‐house designed (tBuMe2Si)2Zn single source precursor for developing SixZnyOz ternary CEI thin films on NMC811 via molecular layer deposition (MLD) in combination with O3 or H2O as oxidizing agent. We demonstrate that the single precursor (tBuMe2Si)2Zn avoids the need for two different precursors (Si & Zn). In‐depth spectroscopic studies reveal the mechanism of the formation of organosiloxane/zinc‐oxide composite thin film, via intermediates of unprecedented organo‐silicon‐zinc compounds. Understanding the reaction mechanism paved the path for a successful deposition of ACEI on NMC811. Rate capability studies shows the ACEI protected cathodes exhibit higher discharge capacity at 4 C than pristine NMC811. Furthermore, studies on full cells with graphite anode were conducted to evaluate the practical viability of SixZnyOz ACEI thin films on NMC811. After prolonged cycling the ACEI‐coated NMC811 full cells significantly improved the electrochemical performance than pristine NMC811 by ~12%. [ABSTRACT FROM AUTHOR]

Published
2024
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37. Dynamic Stereo‐Conformation of Catalyst‐In‐Cavity Biomimetic Enzymes Enable High‐Sulfur‐Utilization and Lean‐Electrolyte Lithium‐Sulfur Batteries.

Author

Dong, Yangyang, Zhang, Haikuo, Cai, Dong, Yang, Shuo, Ying, Peng, Li, Tingting, Zou, Jinxuan, Shu, Meiling, Li, Ruhong, Wang, Jinze, Xiao, Kuikui, Zhou, Xuemei, Nie, Huagui, Fan, Xiulin, and Yang, Zhi

Subjects
CATALYTIC activity, OXIDATION-reduction reaction, SULFUR, CATALYSTS, CATALYSIS, LITHIUM sulfur batteries
Abstract

The key challenges for pursuing high‐energy‐density lithium‐sulfur (Li‐S) batteries lie in struggling sulfur conversions under high‐sulfur‐loading and low electrolyte‐to‐sulfur (E/S) ratio conditions. To mimic high‐efficient natural enzymes, in this work, sulfonated cobalt phthalocyanine (CoPC) is implanted in β‐cyclodextrin (β–CD) cavity for preparing β–CD@CoPC biomimetic catalysts, which enables a good electrochemical contact with solvated lithium polysulfides in a locally enriched electrolyte. Moreover, the dynamic stereo‐conformation evolution of CoPC in hydrophobic β–CD cavity promotes subsequent sulfur redox kinetics and induces the separation of Li2S from the catalyst, further improving catalysis efficiency. The catalytic activity is quantified through specific Michaelis–Menten equations for enzymatic reactions and it showed that β–CD@CoPC improved catalytic ability by 3 and 30 times compared to that of the β–CD and CoPC catalysts, respectively. As a result, the Li–S pouch cell with mere 1.0 wt% β–CD@CoPC exhibits a high initial areal capacity of 11.6 mAh cm−2 under high‐sulfur‐loading (12.8 mg cm−2) and low E/S ratio (3.5 µL mg−1). This strategy provides a feasible way to tackle sulfur conversion issues under lean electrolytes for next‐generation high‐energy batteries. [ABSTRACT FROM AUTHOR]

Published
2024
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50. Upgrading Electrolyte Antioxidant Chemistry by Constructing Potential Scaling Relationship.

Author

Li, Ruhong, Wu, Zunchun, Zhang, Shuoqing, Liu, Jia, Fan, Liwu, Deng, Tao, Chen, Lixin, and Fan, Xiulin

Subjects
ELECTROLYTES, ATOMIC charges, ANTIOXIDANTS, SOLVATION
Abstract

Rational design of advanced electrolytes to improve the high‐voltage capability has been attracting wide attention as one critical solution to enable next‐generation high‐energy‐density batteries. However, the limited understanding of electrolyte antioxidant chemistry as well as the lack of valid quantization approaches have resulted in knowledge gap, which hinders the formulation of new electrolytes. Herein, we construct a standard curve based on representative solvation structures to quantify the oxidation stability of ether‐based electrolytes, which reveals the linear correlation between the oxidation potential and the atomic charge of the least oxidation‐resistant solvent. Dictated by the regularity between solvation composition and oxidation potential, a (Trifluoromethyl)cyclohexane‐based localized high‐concentration electrolyte dominated by anion‐less solvation structures was designed to optimize the cycling performance of 4.5 V 30 μm‐Li||3.8 mAh cm−2‐LiCoO2 batteries, which maintained 80 % capacity retention even after 440 cycles. The consistency of experimental and computational results validates the proposed principles, offering a fundamental guideline to evaluate and design aggressive electrochemical systems. [ABSTRACT FROM AUTHOR]

Published
2024
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